返回 2020 年 1 月的所有订单的订单号和订单日期
select order_num,order_date from Orders where date_format(order_date, '%Y-%m')='2020-01' order by order_date;
select order_num,order_date from Orders where date_format(order_date, '%Y-%m')='2020-01' order by order_date;
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